Detection apparatus and method for near field communication devices

a near field communication and detection apparatus technology, applied in the direction of burglar alarm mechanical actuation, burglar alarm by hand-portable article removal, instruments, etc., can solve the problems of affecting the battery life, cumbersome and inconvenient process, and increasing the complexity of mobile devices today

Inactive Publication Date: 2010-01-26
GOOGLE TECH HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mobile devices today are becoming increasingly complex.
This process is cumbersome and inconvenient.
The other alternative is to have the near-field reader continually ON, which impacts the battery life.

Method used

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  • Detection apparatus and method for near field communication devices
  • Detection apparatus and method for near field communication devices
  • Detection apparatus and method for near field communication devices

Examples

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Embodiment Construction

[0015]Before describing in detail embodiments that are in accordance with the present invention, it should be observed that the embodiments reside primarily in combinations of method steps and apparatus components related to detecting the presence of an inductively coupled object relative to a near-field communication circuit. Accordingly, the apparatus components and method steps have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

[0016]It will be appreciated that embodiments of the invention described herein may be comprised of one or more conventional processors and unique stored program instructions that control the one or more processors to implement, in conjunction with certain ...

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PUM

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Abstract

A near-field communication circuit (100), such as a radio frequency identification circuit, includes a communication coil (104) and a communication circuit (108) configured to transmit data (109) through the communication coil (104). When the communication circuit (108) is in an idle mode, probing circuitry (124) is configured to detect the presence of a magnetically conductive object within close proximity of a communication coil (104). In one embodiment, a control circuit (110) selectively couples a capacitance (125) in parallel with the communication coil (104). The control circuit (110) then applies a probing signal (116) to the communication coil (104). A comparator (118) monitors a secondary parameter of the communication coil (104), such as inductance or impedance. When a magnetically conductive object is detected, the communication circuit (108) transitions to a communication state and attempts to communicate with the object.

Description

BACKGROUND[0001]1. Technical Field[0002]This invention relates generally to electronic devices having near field communication circuitry, and more particularly to a device having a near field communication circuit with a low-power mode, the circuit being able to detect when other near field communication circuits are within close proximity.[0003]2. Background Art[0004]Mobile devices today are becoming increasingly complex. By way of example, a mobile telephone was used—no too long ago—only for making telephone calls. Today, however, some mobile telephones are equipped with near-field communication technology, such as radio frequency identification (RFID) circuits. This near field communication technology can obtain information from other near field communication devices, deliver information to near field communication terminals, and even engage in financial transactions.[0005]By way of example, some mobile device manufacturers have recently developed electronic, or “virtual,” cards ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G08B13/14
CPCG06K19/0717G06K19/0723
Inventor BRAUN, MARKVANNATTA, LOUIS
Owner GOOGLE TECH HLDG LLC
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